ZA: Merge "That Week in Parliament" and "Impressions" on the homepage

PMG have requested that instead of having "Impression" and "That Week in
Parliament" as separate sections on the front page, we merge these two
into a single list across the two columns called "That Week in
Parliament".

Fixes #1516
Move "Rights and ..." to the top of the Public Participation menu

This reordering is as requested by Jessica Musila (@JessMusila)
Remove "MP Data" from the "News" menu, just leaving "Data"

This is as requested by Jessica Musila (@JessMusila)
new mzalendo homepage layout

Tested in Chrome, Firefox, and Opera Mini. Thanks
@wrightmartin for the wireframe and @dracos for some CSS advice!